#include <iostream> #include <algorithm>//必须包含的头文件 using namespace std; int main(){ int point[10] = {1,3,7,7,9}; int tmp = upper_bound(point, point + 5, 7) - point;//按从小到大,7最多能插入数组point的哪个位置 printf("%dn",tmp); tmp = lower_bound(point, point + 5, 7) - point;////按从小到大,7最少能插入数组point的哪个位置 printf("%dn",tmp); return 0; } output: 4 2